Deep Zoom Viewer

Free

Enables viewing and interacting with any Deep Zoom image right on your Windows phone! You can enter a URL that points to any Deep Zoom image (or image collection), or you can browse any of the seven interesting samples that are already provided.
Supports pinch-and-stretch zooming, double tap, and panning gestures.
Create your own Deep Zoom images at http://zoom.it then view them with this app!
Learn how to build this app and many more with Adam Nathan's "101 Windows Phone 7 Apps" book!
http://adamnathan.net